CN108251783A - A kind of preparation method of the micro- texture surface vacuum plasma self-lubricating coat in use of laser - Google Patents
A kind of preparation method of the micro- texture surface vacuum plasma self-lubricating coat in use of laser Download PDFInfo
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- CN108251783A CN108251783A CN201711395150.7A CN201711395150A CN108251783A CN 108251783 A CN108251783 A CN 108251783A CN 201711395150 A CN201711395150 A CN 201711395150A CN 108251783 A CN108251783 A CN 108251783A
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/12—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the method of spraying
- C23C4/134—Plasma spraying
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/04—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the coating material
- C23C4/06—Metallic material
- C23C4/08—Metallic material containing only metal elements
Abstract
A kind of preparation method of the micro- texture surface vacuum plasma self-lubricating coat in use of laser, includes the following steps：(1) substrate surface pre-processes；(2) the micro- texture of scanning machining；(3) it is vacuumized after cleaning；(4) prepared by coating；(5) it post-processes.The preparation method of the micro- texture surface vacuum plasma self-lubricating coat in use of laser of the present invention can reduce the friction coefficient and wear extent of metal surface, extend the working life of texture, and can improve the binding force and thermal fatigue property of coating.
Description
Technical field
The present invention relates to field of metal surface treatment, specifically, being related to a kind of micro- texture surface vacuum plasma of laser
The preparation method of self-lubricating coat in use.
Background technology
The performance of mechanized equipment metal surface plays an important role to its reliability service, wherein the tribology on surface
It can be one of key factor of wear out failure ability for determining component of machine.Fretting wear can cause the table of mechanized equipment part
Face shape and size are slowly continuously damaged during the work time, and the working performance and reliability for causing machine reduce.According to statistics,
The energy used in the world to be consumed in friction there are about 30%-50%, and abrasion caused by rubbing is the main of mechanical equipment failure
Reason, about 80% part of damage is caused by various forms of abrasions.
At present in process for modifying surface, the surface texturing techniques based on surface biomimetic are the raising tables of current great potential
The method of face wearability, however under more severe dry friction operating mode, the structural erosion wear of texture in itself is serious, reduces
The service life of material surface.Accordingly, it is considered to prepare specific coatings in coating surface, reduced while providing protection for texture
Frictional dissipation.Mo has higher thermal conductivity and relatively low thermal diffusivity in many kinds of solids self-lubricating material at present, high in friction
Continuous firing still is able in the operating mode of heat, excellent surface abrasion resistance makes it be particularly suitable for working in Dry Sliding condition
Under, but the technology of preparing of coating is preferable not to the utmost at present, main problem is not strong with the binding force of matrix surface, and for a long time
In the case of fretting wear apply Mo layer cracking, come off can further seriously.
Invention content
For the above-mentioned problems in the prior art, the present invention provides a kind of Surface Texture and plasma spraying self-lubricating
The preparation method of compound Friction-Reducing Coating.In the preparation method, the presence of one side properties of solid self-lubricant coating, which can reduce, to rub
Coefficient is wiped, extends texture working life, the introducing of another aspect texture can store lubriation material, and lasting profit can be provided to coating
It is sliding, and texture can improve coating binding force and thermal fatigue property.
To achieve the above object, the present invention provides a kind of preparation of the micro- texture surface vacuum plasma self-lubricating coat in use of laser
Method includes the following steps：
(1) substrate surface pre-processes
Substrate surface is cleaned and sandblasting pretreatment；
(2) the micro- texture of scanning machining
With solid pulse laser in the micro- texture of substrate surface scanning machining, texture shape is sine curve, and processing is advanced
Direction is perpendicular to the operative orientation of base material；
(3) it is vacuumized after cleaning
Substrate surface after being processed to step (2) texture is cleaned by ultrasonic, and vacuum chamber is put into after cleaning and is vacuumized；
(4) prepared by coating
Under vacuum conditions, coating preparation is carried out to substrate surface using plasma thermal sprayed technique, prepared by spraying first
Then NiAlMo binder courses spray and prepare Mo self-lubricating layers again；
(5) it post-processes
By the base material cooled to room temperature after spraying obtained by step (4), coating surface impurity is removed with compressed air.
Preferably, step (1) blasting craft selects Al2O3Or SiO2Particle, the roughness value on sandblasting rear substrate surface
It is Ra=3-5 μm.
Preferably, step (2) described solid pulse laser is pulse Nd:YAG laser, sweep speed 250-
270mm/s, spot diameter are 100-200 μm, pulse width 100-200ns, pulse frequency 20-30kHz.
Preferably, the width of step (2) micro- texture curve is 150-300 μm, and depth is 50-70 μm.
Preferably, step (2) micro- equidistant parallel distribution of texture curve, spacing 3-4mm.
Preferably, the thickness of step (4) the NiAlMo binder courses is 20-40 μm, and the thickness of Mo self-lubricating layers is 50-80
μm。
Preferably, the powder feeding rate of step (4) described spraying process is 20-25g/min, spray distance 190-220mm.
Preferably, substrate coupons keep rotary motion, rotating speed 60-70r/ in step (4) the coating preparation process
Min, and the sample back side is cooled down with compressed air.
Specifically, the laser parameter of above-mentioned steps (2) is as shown in table 1, and the spray parameters of above-mentioned steps (4) are as shown in table 2.
Table 1
| Power, W | 80-100 |
| Sweep speed, mm/s | 250-270 |
| Spot diameter, μm | 100-200 |
| Scanning times | 3-5 |
| Pulse width, ns | 100-200 |
| Pulse frequency, kHz | 20-30 |
Table 2
Beneficial effects of the present invention：
In preparation method of the present invention, sine curve is processed in a manner of removing material in substrate surface first and is formed
The groove of micro- texture, then spraying forms NiAlMo middle close binders in the above, finally forms Mo self-lubricatings in surface spraying
Coating.Wherein, the groove structure of micro- texture can improve the bond strength of follow-up coating, it is often more important that, in face coat friction
After abrasion reaches a certain level, substrate surface partial denudation, the texture can retain solid self lubricant material and gradually form imitative
Raw wearing layer.NiAlMo binder courses are mainly used for improving the bond strength of Mo sprayed coatings, are especially largely given birth in high-speed dry friction
The capacity of heat transmission of coating is improved under the working condition of heat, so as to improve the Thermal Cycling impact flexibility of coating.Mo self-lubricatings
Coating is mainly the surface condition that material provides self-lubricating solid, reduces friction coefficient and wear extent.
Description of the drawings
Fig. 1 is compound Friction-Reducing Coating schematic diagram；
Fig. 2 is sinusoidal configuration schematic diagram；
Fig. 3 is rotates spraying process schematic diagram in vacuum storehouse；
Fig. 4 is different coating wear extent comparison diagram；
Wherein：
LT-S/VPS-NM：Micro- texture-the sine curve of laser/vacuum plasma spray coating-NiAlMo binder courses of the present invention
And Mo self-lubricating composite coatings；
LT-C/VPS-NM：The micro- texture of laser-uniformly distributed micropore/vacuum plasma spray coating-NiAlMo binder courses and Mo self-lubricatings
Composite coating；
VPS-NM：Using only vacuum plasma spray coating-NiAlMo binder courses and Mo self-lubricating coat in use；
VPS-M：Using only vacuum plasma spray coating-Mo self-lubricating coat in use；
APS-M：Using only air plasma spraying-Mo self-lubricating coat in use；
304L：Uncoated 304L stainless steel bases surface.
Fig. 5 is different figure layer friction coefficient comparison diagrams.
Specific embodiment
Embodiment 1
(1) substrate surface pre-processes
Stainless steel substrate, degreasing and rust removal are selected, surface cleaning selects Al2O3Particle carries out sandblasting pretreatment, base after sandblasting
The roughness value on material surface is Ra=3-5 μm；
(2) the micro- texture of scanning machining
With pulse Nd:YAG laser is in the micro- texture of substrate surface scanning machining, laser parameter：Sweep speed is
250mm/s, spot diameter are 200 μm, pulse width 200ns, pulse frequency 30kHz；Texture shape is sine curve, such as
Shown in Fig. 2, curvilinear equation be y=2sin (36x), each equidistant parallel distribution of curve, spacing 3mm；Processing direction of travel hangs down
Directly in the operative orientation of base material；
(3) it is vacuumized after cleaning
Substrate surface after being processed to step (2) texture is cleaned by ultrasonic, and vacuum chamber is put into after cleaning and is vacuumized；
(4) prepared by coating
As shown in figure 3, under vacuum conditions, coating preparation, spray are carried out to substrate surface using plasma thermal sprayed technique
It is as shown in table 2 to apply parameter, spraying first prepares NiAlMo binder courses, and thickness is 40 μm, then sprays again and prepares Mo self-lubricating layers,
Thickness is 50 μm, and the powder feeding rate of spraying process is 20g/min, spray distance 220mm, substrate coupons in coating preparation process
Rotary motion, rotating speed 60-70r/min are kept, and the sample back side is cooled down with compressed air；
(5) it post-processes
By the base material cooled to room temperature after spraying obtained by step (4), coating surface impurity is removed with compressed air.
The structure diagram of gained coating is as shown in Figure 1.
Embodiment 2
Embodiment 2 and embodiment 1 the difference lies in：
Step (1) selects SiO2Particle carries out sandblasting pretreatment；
Laser parameter in step (2) is：Sweep speed is 270mm/s, and spot diameter is 100 μm, and pulse width is
100ns, pulse frequency 20kHz, curve spacing are 4mm；
The thickness of NiAlMo binder courses is 20 μm in step (4), and the thickness of Mo self-lubricating layers is 80 μm, and spraying process is sent
Powder rate is 25g/min, spray distance 190mm.
The other the same as in Example 1.
Embodiment 3
Embodiment 3 and embodiment 1 the difference lies in：
Laser parameter in step (2) is：Sweep speed is 260mm/s, and spot diameter is 150 μm, and pulse width is
150ns, pulse frequency 25kHz, curve spacing are 3.5mm；
The thickness of NiAlMo binder courses is 30 μm in step (4), and the thickness of Mo self-lubricating layers is 70 μm, and spraying process is sent
Powder rate is 22g/min, spray distance 200mm.
The other the same as in Example 1.
Wear test：
1 gained substrate coating of Example, investigates its wear extent and friction coefficient under following experiment conditions.
Experimental facilities：The CETR-UMT-3MO type multifunction friction wear testing machines of BRUKER companies production；
Friction mode：Reciprocating dry friction；
Test ambient temperature：Room temperature；
The way of contact：Ball-disk contact；
To abrading-ball：The steel ball of bearing steel of a diameter of 9.5mm；
Test period：240min；
Sliding speed：8mm/s；
Test load：10N.
Result of the test is shown in Fig. 4, Fig. 5.
In terms of wear extent, as shown in figure 4, the coating prepared by this patent is in the continuous frictional wear test of 4 hours,
Wear extent remains reduced levels.From the point of view of frictional experiment early period and mid-term, four kinds of vacuum plasma spray coating layers it is wear-resistant
Ability is substantially better than plasma-sprayed coating layers and matrix in itself, these four coatings are distinguishable from one another less, prepared by this patent
Coating is slightly better than other three kinds, but the phase after the test, by the abrasion of long period, Mo self-lubricating layers and NiAlMo binder courses
Wear extent accumulation to a certain extent, partly start exposed, the effect of the micro- texture of laser starts to embody, coating prepared by this patent
Wear extent is minimum, is that laser micropore composite earth applies, followed by untextured airless spraying layer later, this illustrates the micro- texture pair of laser
There is remarkable effect in the lasting antiwear property for improving stainless steel surface, it can be by changing friction condition and mechanism, preservation
And the wear extent of material surface is greatly reduced in the modes such as sustained release self-lubricating material, meanwhile, the sine curve of this patent is micro- to be knitted
It is more effective in terms of antiwear property is improved that structure is relatively evenly distributed with micropore texture；In addition, compared with conventional air plasma spraying,
Vacuum plasma rotary spraying can obtain more fine and close coating used by this patent, so as to further reduce coating
Wear extent, and then extend the service life of material.
In terms of friction coefficient, as shown in figure 5, experiment front half section (1-2Hours) major embodiment is Mo self-lubricatings surface layer
Antifriction effect, the friction coefficient for the vacuum plasma spray coating layer that this patent uses are significantly lower than air sprayed coating, are obtained under vacuum
Dense coating be more advantageous to reduce friction coefficient；The second half section (3-4Hours) is tested due to the accumulation of wear extent, matrix surface
Partial denudation, then embody the compound antifriction effect of laser texturing and coating.From fig. 5, it can be seen that the presence of laser texturing
So that material surface remains to keep under the conditions of long-time fretting wear relatively low friction coefficient, especially this patent to use just
The micro- texture of chord curve, compared with conventional uniformly distributed micropore texture, the friction coefficient on surface is minimum, therefore prepared by this patent
Compound Friction-Reducing Coating is more effective in terms of skin-friction coefficient is reduced.
Claims (8)
1. a kind of preparation method of the micro- texture surface vacuum plasma self-lubricating coat in use of laser, which is characterized in that including walking as follows
Suddenly：
(1) substrate surface pre-processes
Substrate surface is cleaned and sandblasting pretreatment；
(2) the micro- texture of scanning machining
With solid pulse laser in the micro- texture of substrate surface scanning machining, texture shape is sine curve, processes direction of travel
Perpendicular to the operative orientation of base material；
(3) it is vacuumized after cleaning
Substrate surface after being processed to step (2) texture is cleaned by ultrasonic, and vacuum chamber is put into after cleaning and is vacuumized；
(4) prepared by coating
Under vacuum conditions, coating preparation is carried out to substrate surface using plasma thermal sprayed technique, prepared by spraying first
Then NiAlMo binder courses spray and prepare Mo self-lubricating layers again；
(5) it post-processes
By the base material cooled to room temperature after spraying obtained by step (4), coating surface impurity is removed with compressed air.
2. a kind of preparation method of the micro- texture surface vacuum plasma self-lubricating coat in use of laser according to claim 1,
It is characterized in that, step (1) blasting craft selects Al2O3Or SiO2Particle, the roughness value on sandblasting rear substrate surface is Ra=
3-5μm。
3. a kind of preparation method of the micro- texture surface vacuum plasma self-lubricating coat in use of laser according to claim 1,
It is characterized in that, step (2) described solid pulse laser is pulse Nd:YAG laser, sweep speed 250-270mm/s, light
Spot diameter is 100-200 μm, pulse width 100-200ns, pulse frequency 20-30kHz.
4. a kind of preparation method of the micro- texture surface vacuum plasma self-lubricating coat in use of laser according to claim 1,
It is characterized in that, the width of step (2) micro- texture curve is 150-300 μm, and depth is 50-70 μm.
5. a kind of preparation method of the micro- texture surface vacuum plasma self-lubricating coat in use of laser according to claim 1,
It is characterized in that, step (2) micro- equidistant parallel distribution of texture curve, spacing 3-4mm.
6. a kind of preparation method of the micro- texture surface vacuum plasma self-lubricating coat in use of laser according to claim 1,
It is characterized in that, the thickness of step (4) the NiAlMo binder courses is 20-40 μm, and the thickness of Mo self-lubricating layers is 50-80 μm.
7. a kind of preparation method of the micro- texture surface vacuum plasma self-lubricating coat in use of laser according to claim 1,
It is characterized in that, the powder feeding rate of step (4) described spraying process is 20-25g/min, spray distance 190-220mm.
8. a kind of preparation method of the micro- texture surface vacuum plasma self-lubricating coat in use of laser according to claim 1,
It is characterized in that, substrate coupons keep rotary motion in step (4) the coating preparation process, and rotating speed 60-70r/min is used in combination
Compressed air cools down the sample back side.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108760553A (en) * | 2018-07-20 | 2018-11-06 | 东华大学 | A kind of corrosion proof method after quickly testing self-lubricating steel plate cold deformation processing |
| CN110374881A (en) * | 2019-08-26 | 2019-10-25 | 珠海格力节能环保制冷技术研究中心有限公司 | Friction structure, friction parts and compressor |
| CN111853516A (en) * | 2020-06-15 | 2020-10-30 | 中国科学院兰州化学物理研究所 | Method for obtaining two-dimensional composite super-lubricating surface on engineering base material |
| CN113084174A (en) * | 2021-04-12 | 2021-07-09 | 北京工商大学 | 3D printing stainless steel part for food processing machinery and preparation process thereof |
| CN113118362A (en) * | 2021-04-21 | 2021-07-16 | 江苏大学 | Gear hot-forging die and surface high-temperature self-lubricating treatment method thereof |
| CN113280115A (en) * | 2021-06-24 | 2021-08-20 | 青岛理工大学 | Micro-texture piston ring and processing method |
| CN114908339A (en) * | 2022-04-24 | 2022-08-16 | 中国石油大学(华东) | Preparation method of laser-textured nickel-phosphorus alloy anti-balling composite coating |
| CN116221050A (en) * | 2023-03-07 | 2023-06-06 | 华侨大学 | Sliding shoe with self-lubricating surface, preparation method thereof and sliding shoe pair |
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| CN113118362A (en) * | 2021-04-21 | 2021-07-16 | 江苏大学 | Gear hot-forging die and surface high-temperature self-lubricating treatment method thereof |
| CN113280115A (en) * | 2021-06-24 | 2021-08-20 | 青岛理工大学 | Micro-texture piston ring and processing method |
| CN114908339A (en) * | 2022-04-24 | 2022-08-16 | 中国石油大学(华东) | Preparation method of laser-textured nickel-phosphorus alloy anti-balling composite coating |
| CN116221050A (en) * | 2023-03-07 | 2023-06-06 | 华侨大学 | Sliding shoe with self-lubricating surface, preparation method thereof and sliding shoe pair |
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